[经] normal theory applied to sampling method

yòng yú chōu yàng fǎ de zhèng tài lǐ lùn ㄩㄥˋ ㄩˊ ㄔㄡ ㄧㄤˋ ㄈㄚˇ ㄉㄜ˙ ㄓㄥˋ ㄊㄞˋ ㄌㄧˇ ㄌㄨㄣˋ